Direction-Finding Study of a 1.7 mm Diameter Towed Hydrophone Array Based on UWFBG

被引：3
作者：
Wu, Su [1 ,2 ]
Huang, Junbin [1 ]
Pang, Yandong [1 ]
Wang, Jiabei [1 ]
Gu, Hongcan [1 ]
机构：
[1] Naval Univ Engn, Dept Weaponry Engn, Wuhan 430033, Peoples R China
[2] Naval Univ Engn, Dept Elect Engn, Wuhan 430033, Peoples R China
来源：
SENSORS | 2024年 / 24卷 / 13期
基金：
中国国家自然科学基金;
关键词：
fiber-optic sensor; UWFBG; distributed sensor; hydrophone; direction finding; PERFORMANCE; SYSTEM;
D O I：
10.3390/s24134300
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
This paper investigates a 1.7 mm diameter ultra-weak fiber Bragg grating (UWFBG) hydrophone towed array cable for acoustic direction finding. The mechanism of the underwater acoustic waves received by this integrated-coating sensitizing optical cable is deduced, and it is shown that the amplitude of its response varies with the direction of the sound wave. An anechoic pool experiment is carried out to test the performance of such a hydrophone array. The test array is a selection of six sensing fibers, each of which is coiled into 9 cm diameter fiber ring suspended in the water to receive acoustic signals. An average sensitivity of -141.2 dB re rad/mu Pa at frequencies from 2.5 kHz to 6.3 kHz was achieved, validating the detection of the azimuth of underwater acoustic waves. The ultra-thin towing cable system, with free structure, high sensitivity, and underwater target-detection capability has demonstrated great potential for future unmanned underwater vehicle (UUV) applications.
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页数：13
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